Cocktail is an award winning general purpose utility for Mac OS X. It is a smooth and powerful digital toolset with a variety of practical features that simplifies the use of advanced UNIX functions and helps hundreds of thousands of Mac users around the world to get the most out of their computers.

The application serves up a scrumptious mix of maintenance tools and interface tweaks, all accessible via a comprehensive graphical interface. Most of Cocktail's major features are arranged in five basic categories. In addition, a Pilot lets you clean, repair and optimize your system with one click of the button.

The market for these kinds of apps is kind of crowded these days. I registered Cocktail in 2002 when maintenance apps for OS X were few and far between. This app is still one of the best and well worth its price.

Pointless. Everything that this app does can be done in Terminal, for free.

It's also not very well written - some versions of it actually, through stupid programming, revealed your admin password to everyone on the machine, by doing something in the form of
echo "your password" | sudo some_command.